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  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Hydrography  \Hy*drog"ra*phy\,  n.  [Hydro-,  1  +  -graphy:  cf  F. 
  hydrographie.] 
  1.  The  art  of  measuring  and  describing  the  sea,  lakes, 
  rivers,  and  other  waters,  with  their  phenomena. 
 
  2.  That  branch  of  surveying  which  embraces  the  determination 
  of  the  contour  of  the  bottom  of  a  harbor  or  other  sheet  of 
  water,  the  depth  of  soundings,  the  position  of  channels 
  and  shoals,  with  the  construction  of  charts  exhibiting 
  these  particulars. 
 
  From  WordNet  r  1.6  [wn]: 
 
  hydrography 
  n  :  the  science  of  the  measurement  and  description  and  mapping 
  of  the  surface  waters  of  the  earth  with  special  reference 
  to  navigation 

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